# -*- coding: utf-8 -*-

# Define here the models for your spider middleware
#
# See documentation in:
# https://doc.scrapy.org/en/latest/topics/spider-middleware.html

from scrapy import signals
import random
import urllib
import json
import logging
import re


class Music163ScrapySpiderMiddleware(object):
    # Not all methods need to be defined. If a method is not defined,
    # scrapy acts as if the spider middleware does not modify the
    # passed objects.

    @classmethod
    def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def process_spider_input(self, response, spider):
        # Called for each response that goes through the spider
        # middleware and into the spider.

        # Should return None or raise an exception.
        return None

    def process_spider_output(self, response, result, spider):
        # Called with the results returned from the Spider, after
        # it has processed the response.

        # Must return an iterable of Request, dict or Item objects.
        for i in result:
            yield i

    def process_spider_exception(self, response, exception, spider):
        # Called when a spider or process_spider_input() method
        # (from other spider middleware) raises an exception.

        # Should return either None or an iterable of Response, dict
        # or Item objects.
        pass

    def process_start_requests(self, start_requests, spider):
        # Called with the start requests of the spider, and works
        # similarly to the process_spider_output() method, except
        # that it doesn’t have a response associated.

        # Must return only requests (not items).
        for r in start_requests:
            yield r

    def spider_opened(self, spider):
        spider.logger.info('Spider opened: %s' % spider.name)


class Music163ScrapyDownloaderMiddleware(object):
    # Not all methods need to be defined. If a method is not defined,
    # scrapy acts as if the downloader middleware does not modify the
    # passed objects.

    @classmethod
    def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def process_request(self, request, spider):
        # Called for each request that goes through the downloader
        # middleware.

        # Must either:
        # - return None: continue processing this request
        # - or return a Response object
        # - or return a Request object
        # - or raise IgnoreRequest: process_exception() methods of
        #   installed downloader middleware will be called
        return None

    def process_response(self, request, response, spider):
        # Called with the response returned from the downloader.

        # Must either;
        # - return a Response object
        # - return a Request object
        # - or raise IgnoreRequest
        return response

    def process_exception(self, request, exception, spider):
        # Called when a download handler or a process_request()
        # (from other downloader middleware) raises an exception.

        # Must either:
        # - return None: continue processing this exception
        # - return a Response object: stops process_exception() chain
        # - return a Request object: stops process_exception() chain
        pass

    def spider_opened(self, spider):
        spider.logger.info('Spider opened: %s' % spider.name)


class UserAgentMiddleware(object):
    def __init__(self, agents):
        self.agents = agents

    @classmethod
    def from_crawler(cls, crawler):
        return cls(crawler.settings.getlist('USER_AGENT'))
    
    def process_request(self, request, spider):
        request.headers.setdefault('User-Agent', random.choice(self.agents))

class IPProxyMiddleware(object):
    def __init__(self, ipProxy):
        ipRes = urllib.request.urlopen(
            'http://144.202.2.170:5000/ips/page?size=10&page=0')
        ipsJson = json.loads(ipRes.read())
        ipsList = []
        for ipIndex in range(len(ipsJson)):
            ipStr = ipsJson[ipIndex]['protocol'].lower() + '://' + \
                ipsJson[ipIndex]['ip'] + ':' + ipsJson[ipIndex]['port']
            ipsList.append(ipStr)
        if (len(ipsList) >= 15):
            self.ipProxy = ipsList
            logging.info('----------------服务器抓取IP-------------------')
            logging.info(ipsList)
        else:
            self.ipProxy = ipProxy
            logging.info('----------------本地IP-------------------')
            logging.info(ipProxy)

    @classmethod
    def from_crawler(cls, crawler):
        return cls(crawler.settings.getlist('PROXY_IPS'))

    def process_request(self, request, spider):
        request.meta['proxy'] = random.choice(self.ipProxy)
        logging.info('============当前IP池=================')
        logging.info(self.ipProxy)

    def process_exception(self, request, exception, spider):
        logging.info('============代理ip出现异常=================')
        print(request.meta['proxy'])
        if request.meta['proxy'] in self.ipProxy:
            self.ipProxy.remove(request.meta['proxy'])
            print(len(self.ipProxy))
        # logging.info(request)
        request.meta['proxy'] = random.choice(self.ipProxy)
        # logging.info('============当前IP=================')
        # logging.info(request.meta['proxy'])
        return request
